What is the best cat litter that changes color to detect potential health issues like UTIs or bladder stones?

The leading and most popular option on the market for color-changing health-monitoring cat litter is PrettyLitter . However, there are a few alternative brands and add-on products that use similar silica-based pH and abnormality-detection technology.

Top Health-Monitoring Litters & Additives

- **Type:** Silica crystal, non-clumping.
- **How it works:** It uses lightweight, highly absorbent silica gel crystals that react to abnormalities in urine chemistry.
- **The Color Breakdown:** 
	- *Normal/Yellow/Olive Green:* Healthy urine.
	- *Blue/Dark Green:* High alkalinity, which can signal a urinary tract infection (UTI) or an increased risk for certain types of bladder stones.
	- *Orange/Yellow-Orange:* High acidity, which can indicate metabolic acidosis or specific crystal risks.
	- *Red/Pink:* Presence of blood, indicating potential inflammation, bladder stones, or lower urinary tract disease.[](https://www.prettylitter.com/) [[1]](https://www.prettylitter.com/?srsltid=AfmBOopXAv-nCpSYyfC0U_GOdxSt1yrv-nNZ6-H-mUtuHNj10OHt_DeZ)[[2]](https://www.google.com/search?q=product&prds=pvt:hg,productid:594418003718434894&ibp=oshop)[[3]](https://www.google.com/search?q=product&prds=pvt:hg,productid:17320577318372058301,catalogid:10930536175577294693,gpcid:9304057485345102216,mid:576462846487591186&ibp=oshop)

- **Type:** Silica crystal, non-clumping.
- **How it works:** Very similar to PrettyLitter, it uses fine silica crystals designed to trap odors and moisture while shifting colors based on alkalinity, acidity, and blood detection. It functions as a direct subscription or individual purchase alternative.[[1]](https://www.google.com/search?q=product&prds=pvt:hg,productid:3964515439211786780,catalogid:4624981416711842704,gpcid:4995362558160011508,mid:576462531926824588&ibp=oshop)

- **Type:** Silica crystal.
- **How it works:** Purina's entry into the health-monitoring space uses pH-sensing technology embedded in crystal litter to flag abnormal shifts in your cat's urine.

- **Type:** Color-changing indicator pellets/crystals.
- **How it works:** If you don't want to completely switch your cat's preferred clay or wood litter, these are sprinkled on top of your existing litter. They change color when they come into contact with abnormal pH or blood, saving you from transitioning your cat to a whole new texture.[[1]](https://www.google.com/search?q=product&prds=pvt:hg,productid:10535983064511728188,catalogid:18375818479617600316,gpcid:16970649076398281073,mid:576462841252211452&ibp=oshop)

What to Keep in Mind

• Not a Diagnosis: Color-changing litters are fantastic early-warning systems—especially because cats instinctively hide pain and illness. However, they are not diagnostic tools and do not replace a urinalysis or veterinary exam.
• False Alarms & Diet: Diet heavily influences urine pH. A sudden change in cat food can sometimes trigger an abnormal color reading on the litter without an underlying disease. If you see a persistent abnormal color (especially blue or red), it's time to call the vet.
• Multi-Cat Challenges: In a multi-cat household, it is hard to tell which cat produced the abnormal color change unless you isolate them or use specialized monitoring.

If you'd like, let me know:

• Is this for a single-cat or multi-cat household?
• Does your cat currently have symptoms (like straining or urinating outside the box), or are you just looking for routine preventative monitoring?

I can help you decide whether a full litter switch or a simple litter additive makes the most sense.

If your main goal is early warning of urinary problems such as UTIs, crystals, or bladder stones, the strongest overall option I found is PrettyLitter Health Monitoring.

• PrettyLitter Health Monitoring Cat Litter - $48.48 (Chewy)

Why PrettyLitter stands out

• Blue/dark green: indicates unusually alkaline urine, which can occur with some UTIs and is associated with increased risk of struvite crystals/stones.
• Orange: indicates unusually acidic urine, which can be associated with metabolic/kidney issues and increased likelihood of calcium oxalate crystals.
• Red: indicates visible blood, which can occur with bladder inflammation, stones/crystals, UTIs, kidney problems, and other conditions.
• Yellow/olive green: generally falls within its typical urine-pH range.

Importantly, it's a screening/monitoring tool, not a UTI or bladder-stone test. A normal color doesn't rule out disease, and an abnormal color doesn't prove a particular diagnosis. PrettyLitter itself explicitly says it cannot diagnose medical conditions.

Other good options

• Purina Tidy Cats Tidy Care Alert Health Monitoring - $27.98 (Chewy)
• CheckUp Health Indicator Cat Litter - $24.95 (Chewy)
• Sustainably Yours Health Monitoring Formula - $28.99 (PETCO)
• Purrify Health Monitoring Unscented - $31.99 (Chewy)

Purina Tidy Cats Tidy Care Alert is probably the most compelling alternative if you'd rather buy a familiar mainstream brand. It uses silica crystals with pH-detection technology. Purina Tidy Cats

Sustainably Yours Health Monitoring is interesting if you prefer plant-based clumping litter rather than silica; its monitoring technology is designed to detect urine-pH changes. Sustainably Yours

One important caveat

Color-changing litter is particularly useful for spotting something abnormal, but it isn't reliable enough to use as a substitute for urinalysis. Even veterinary-reviewed evaluations note that false positives and false negatives can occur.

And if your cat is straining to urinate, repeatedly entering the box with little/no urine, crying, licking the genital area excessively, or showing blood in the urine, don't wait for the litter to change color—especially in a male cat, inability to urinate can be a life-threatening emergency.

If you tell me (1) your cat's age/sex, (2) one or multiple cats, and (3) whether you prefer clumping, non-clumping, or don't care, I can narrow these down to the best 2–3 choices and compare accuracy, cost, odor control, tracking, and how good they are specifically for urinary monitoring.

The most well-known and widely recognized cat litter on the market that changes color to detect potential urinary tract issues is PrettyLitter.

How PrettyLitter Works

PrettyLitter is made of lightweight silica gel crystals rather than traditional clay . It is engineered to change color when it comes into contact with specific abnormalities in a cat's urine:

• Normal (Dark Yellow / Olive Green): Indicates urine is within a typical pH range and no abnormal levels are detected.
• High Alkalinity (Blue): May indicate a high pH level, which is often associated with urinary tract infections (UTIs) or an increased risk of struvite stone formation.
• High Acidity (Orange / Yellow-Orange): Can indicate overly acidic urine, which is linked to metabolic acidosis or an increased risk of calcium oxalate stones.
• Blood (Red): The appearance of red or pink spots signals the presence of blood, which can point to bladder stones, inflammation, or lower urinary tract disorders.

Important Considerations

• Not a Diagnosis: Color-changing litters are helpful early-warning indicators, but they cannot replace professional veterinary care or diagnostics . If your cat's litter consistently changes color or shows abnormal signs, a trip to the vet for a urinalysis is necessary.
• Multi-Cat Households: Monitoring can be tricky if you have more than one cat using the same box, as it's hard to tell which cat triggered a color change.
• Where to Buy: You can buy or compare options directly through the PrettyLitter Official Website or major pet retailers like Chewy and PetSmart.

If you'd like, let me know:

• How many cats you have
• Whether your cat is showing any physical symptoms (like straining to urinate or frequent trips to the box)

I can give you more tailored advice on monitoring or when to schedule a vet visit.

If you’re looking for cat litter that changes color to flag possible urinary problems (UTIs, bladder stones, blood in urine, abnormal urine pH), the best-known options are health-monitoring crystal litters. They are early-warning tools, not diagnostic tests—a color change means “consider calling your vet,” not that a specific disease is confirmed.

Here are the strongest options:

How I’d choose

• For a cat with past UTIs, crystals, bladder stones, or kidney concerns: a pH-monitoring litter like PrettyLitter or Tidy Care Alert is useful because it can help you notice changes sooner.
• If your cat refuses crystal litter: choose a clumping health-monitoring option such as Fresh Step’s formula.
• If you have multiple cats: these litters are less informative because you may not know which cat caused the color change.

Important warning signs that should not wait for litter clues

Contact a veterinarian promptly if you notice:

• Straining to urinate
• Frequent trips to the box with little urine
• Crying while urinating
• Blood in urine
• Urinating outside the litter box

A male cat that is repeatedly trying to urinate but producing little or no urine can have a life-threatening urinary blockage and needs urgent veterinary care.

If you tell me your cat’s age, sex, number of cats, current litter type (clay/crystal/pellet), and whether there’s a history of UTIs or stones, I can narrow down which one fits best.

If your goal is a color-changing litter that may flag urinary problems like possible UTIs, urinary crystals, or bladder stones, the most established option is:

Best overall: PrettyLitter Health Monitoring Cat Litter

PrettyLitterWhy it stands out:

• Changes color based on urine chemistry: - 🟢 Yellow/olive green: typical range
• 🔵 Blue/dark green: more alkaline urine, which can be associated with some UTIs or increased struvite crystal/stone risk
• 🟠 Orange: more acidic urine, which can be associated with other urinary changes
• 🔴 Red: possible blood in urine (which can occur with bladder inflammation, stones, or other urinary issues)

PrettyLitter- Silica crystal litter: lightweight, low dust, and strong odor control.

• Good fit for: - Senior cats
• Cats with a history of urinary issues
• Single-cat households where you can identify whose urine changed

VetstreetLimitations:

• It does not diagnose a UTI or bladder stones—it only detects changes that may warrant a vet check. A urinalysis is needed for diagnosis.
• It may be less useful in multi-cat homes unless you can tell which cat produced the urine.
• Some cats dislike crystal textures if they are used to clay litter.

Other options worth considering

• Purina Tidy Cats Tidy Care Alert Health Monitoring Litter — a silica crystal litter with pH-based color changes; a good alternative if you already prefer Purina products.
• Sustainably Yours Health Monitoring Formula — a newer plant-based clumping option that uses pH-sensitive technology rather than silica crystals.
• CheckUp Health Indicator Litter — another crystal-based option designed to flag pH changes and possible blood.

My practical pick:

• Most urinary-health-focused households: PrettyLitter.
• Cat hates crystals: try a clumping health-monitoring formula like Sustainably Yours.
• Multiple cats: these litters are less useful unless you can identify which cat triggered the color change.

If your cat is male, older than ~7–8 years, has had urinary blockages, or is prone to crystals, I’d also prioritize a litter box setup that makes it easy to notice changes in frequency, straining, and urine volume—not just color. A cat repeatedly straining to urinate or producing little/no urine is an emergency, especially in male cats.

Health-monitoring, color-changing cat litters rely on silica crystal substrates embedded with pH- and blood-detecting indicators . They are designed to give you an early warning system for feline lower urinary tract disorders (FLUTD), including UTIs and bladder stones.

The top options on the market vary by formulation, cost, and how they are used:

Top Color-Changing Litters

1. PrettyLitter (Best Overall / Market Leader)
   • Type: Non-clumping silica crystal
   • How it works: Normal urine keeps the crystals a baseline dark yellow/olive green. High alkalinity (which can signal a UTI or struvite stones) turns the crystals blue/dark green . High acidity (risk of calcium oxalate stones or kidney issues) turns them orange . The presence of blood turns them red.
   • Pros: Highly reliable brand recognition, ultra-lightweight, excellent moisture absorption and odor trapping, and very low dust (great for cats or owners with asthma).
   • Cons: Expensive compared to traditional clay; non-clumping means you only scoop poop and stir the crystals daily.
2. Genius Litter by Alpha Paw (Best Alternative)
   • Type: Non-clumping silica crystal
   • How it works: Similar pH- and blood-reactive crystal matrix that shifts to blue, orange, or red depending on abnormalities.
   • Pros: Often a bit more cost-effective or easier to purchase in flexible quantities compared to subscription-only models. Dust-free and lightweight.
   • Cons: Like all crystal litters, tracking can be an issue if you don't use a good catch-mat.
3. Fresh Step Clumping Health Monitoring Litter (Best Hybrid / Clay-Compatible)
   • Type: Traditional clay clumping litter + color-changing additive
   • How it works: Instead of replacing all your litter with crystals, you use your standard clumping clay and sprinkle an included sachet of Blücare® color-changing granules on top. It specifically targets the detection of blood in the urine (turning blue).
   • Pros: Allows you to keep using the traditional clay texture your cat already prefers; actual clumping makes waste removal familiar.
   • Cons: Primarily monitors for blood rather than a comprehensive pH spectrum (acidic vs. alkaline).
4. World’s Best Cat Litter Health Check-In Boosters (Best Add-On)
   • Type: Additive powder/granules
   • How it works: A patented additive that you sprinkle over any existing brand of cat litter to check for blood (hematuria) in the urine.
   • Pros: You don't have to force your cat to transition to an entirely new litter texture.

What the Colors Mean (General Guide)

• Dark Yellow / Olive Green: Normal, healthy baseline.
• Blue / Dark Green: High alkalinity/pH, suggesting a potential UTI or struvite crystal/stone risk.
• Orange / Deep Yellow: High acidity, suggesting a risk of calcium oxalate crystals or metabolic issues.
• Red: Presence of blood, indicating inflammation, stones, or a severe UTI. (Note: If you see red, contact a vet immediately).

Important Caveats to Keep in Mind

• Multi-Cat Households: Health-monitoring litters lose a lot of their utility if you have multiple cats because you won't know which cat triggered the color change.
• False Positives/Dietary Shifts: Certain foods or temporary hydration changes can slightly alter urine pH and trigger a mild color shift without an active emergency.
• Not a Diagnosis: These litters are daily screening tools and never replace veterinary exams, urinalysis, or professional medical care.

If you'd like to narrow this down, let me know:

• Do you have a single cat or multiple cats?
• Does your cat currently prefer clay, crystals, or natural/plant-based litter?

I can help you choose the option that will cause the least transition resistance for your cat.

If your main goal is early warning of urinary problems, the strongest options are color-changing litters that monitor urine pH and/or blood. They can be useful, but none can actually diagnose a UTI or bladder stones.

Best options

PrettyLitter Health Monitoring Cat Litter

$53.86

Purina Tidy Cats Tidy Care Alert

$20.99

Sustainably Yours Health Monitoring Formula

$28.99

CheckUp Health Indicator Cat Litter

$21.95

PETKIT Occult Blood Test Cat Litter

$44.99

1. PrettyLitter — best overall for health monitoring

PrettyLitter is probably the most established choice if urinary-health monitoring is your priority. Its crystals change color based on urine pH and can show visible blood:

• 🟢 Yellow/olive: typical pH
• 🔵 Blue/dark green: alkaline urine, which can be associated with some UTIs and increased risk of struvite crystals/stones
• 🟠 Orange: unusually acidic urine, associated with different potential urinary/metabolic issues
• 🔴 Red: blood in the urine, which can occur with bladder inflammation, crystals/stones, kidney problems, and other conditions.

A veterinary review published in 2026 also describes it as a useful passive at-home monitoring tool, particularly for cats with urinary/kidney histories, while emphasizing that a color change isn't a diagnosis.

2. Cat's Pride Health Monitor — good alternative

Cat's Pride's Health Monitor Micro Crystals use pH indicators and specifically flag high or low urine pH. Blue/dark green can indicate alkaline urine associated with potential UTIs or increased bladder-stone risk, while red indicates blood.

3. PETKIT — interesting if blood detection is your biggest concern

PETKIT has products designed around occult blood detection, including plant-based/tofu litter formulations. That's somewhat different from traditional pH-monitoring crystal litter and could be worth considering if you're particularly concerned about blood in the urine.

One important caveat

Color-changing litter is an early-warning system, not a UTI/stones test. For example, alkaline urine doesn't necessarily mean a UTI, and normal-looking litter doesn't rule out one. PrettyLitter itself explicitly says it cannot diagnose or confirm conditions.

If your cat is straining to urinate, repeatedly going into the box, producing only drops/no urine, crying while urinating, licking the genital area excessively, or has blood in the urine, don't wait for the litter to change color—especially in a male cat. A urinary blockage can become an emergency.

Bottom line: For a cat where you're specifically trying to catch urinary problems early, I'd put PrettyLitter Health Monitoring Unscented at the top of the list, assuming your cat accepts silica/crystal litter. The unscented version is preferable to scented litter when monitoring urine changes.

PrettyLitter's official health-monitoring information 

When it comes to color-changing, health-monitoring litters designed to spot pH imbalances, UTIs, and the early precursors of bladder stones, a few standout brands dominate the market . Most of these options use specialized silica crystal technology or top-layer indicator sprinkles that react chemically to your cat's urine.

Top Color-Changing Litters on the Market

• PrettyLitter (The Gold Standard): Widely considered the most reliable and popular choice. It uses lightweight, non-clumping silica gel crystals engineered to change color based on urine pH (detecting high alkalinity for UTIs/struvite stones or high acidity for metabolic/kidney issues) as well as revealing red tones if blood is present. It boasts great odor control for liquid waste and low dust.
• Purina Tidy Cats Tidy Care Alert : A budget-friendly, more traditional texture alternative that is widely accessible in stores. It shifts cleanly from its baseline yellow/olive green to blue/dark green (alkaline/UTI risk) or orange (acidic).
• Fresh Step Crystals Health Monitoring : Combines Fresh Step’s classic crystal odor control with𝐵𝑙𝑢̈𝑐𝑎𝑟𝑒® or similar pH/blood-detecting technology. It's lightweight, easy to manage, and includes a clear color guide on the bag.
• Ultra by Cat's Pride Health Monitor : Another strong micro-crystal contender that is 60% lighter than standard clay, low-dust, and formulated to visually distinct color ranges (blue for high pH, orange for low pH).
• Arm & Hammer Litter Health IQ (Additive) : If you don't want to switch your cat's favorite normal litter entirely, this is a color-changing health indicator additive you can sprinkle on top of your existing clay or natural litter.

Understanding the Color Guide

While specific hues vary slightly by brand, most manufacturers follow this general diagnostic spectrum:

• Yellow to Olive Green : Normal, healthy baseline urine pH.
• Blue or Dark Green : High alkalinity (high pH), which can indicate a urinary tract infection (UTI) or an increased risk for struvite crystal and stone formation.
• Deep Yellow or Orange : High acidity (low pH), which may point toward metabolic acidosis or an increased risk for calcium oxalate stones.
• Red : The presence of blood, signaling potential inflammation, lower urinary tract disorders, or bladder/kidney stones.

Important Limitations to Keep in Mind

• Not a Diagnosis : These litters are passive observation tools, not medical diagnostics . A color change is an early warning system telling you it is time to schedule a vet visit for a proper urinalysis.
• Multi-Cat Challenges : If you have more than one cat, it is very difficult to know which cat triggered a blue or orange color change. To use these effectively in a multi-cat home, you typically need to isolate cats into separate temporary litter boxes when monitoring.
• False Positives : Diet changes, hydration levels, and the age of the litter itself can occasionally skew pH results. If a non-normal color persists for more than 24 to 48 hours, consult your veterinarian.

If you'd like to narrow this down, tell me:

• Do you have a single cat or a multi-cat household?
• Does your cat prefer crystals, clay, or plant-based litter textures?

I can help you pick the best match for your setup.

The most popular and widely reviewed health-monitoring cat litter is [PrettyLitter Go to product viewer dialog for this item. ](https://www.prettylitter.com/?srsltid=AfmBOoqlJIENk6Fv1Aaq0T4hfDxDCp55g4lvnLDrseQmXrms0-LnGaWr) , a silica gel crystal litter that changes color based on the pH levels and components in your cat's urine. Other notable alternatives include [Purina Tidy Cats Tidy Care Alert Go to product viewer dialog for this item. ](https://www.purina.com/tidy-cats/tidy-care-alert-cat-litter) and [Genius Litter Go to product viewer dialog for this item. ](https://www.tiktok.com/@geniuslitter/video/7341201907425299755) , which use similar chemical indicator technologies. These litters function as an early warning system rather than a diagnostic tool, flagging abnormalities for a veterinarian to formally test.

How Color-Changing Litter Works

The crystals react to the acidity (pH), alkalinity (pH), or presence of abnormal substances like blood in the urine.

Top Options Compared

Lightweight silica crystals ; highly effective at odor control; changes colors across a clear spectrum for acidity, alkalinity, and blood; low dust.

Purina Tidy Cats Tidy Care Alert : Uses absorbent mineral granules designed to shift colors similarly (blue/green for alkalinity, orange for acidity, red for blood) as a baseline health tracker.

Another silica-based diagnostic crystal option targeting abnormal pH shifts to alert owners of early inflammation or infection.

If you'd like, let me know:

• Is your cat exhibiting any current symptoms (like straining or urinating outside the box)?
• Do you prefer crystals, clay, or natural/eco-friendly litter textures?

I can help you choose the right brand or prepare questions for your vet.

If you’re looking for color-changing cat litter to help spot possible urinary issues (UTIs, crystals, bladder stones, blood in urine), the best-known options are health-monitoring crystal litters. None of them can diagnose a UTI or bladder stones, but they can act as an early warning signal that something has changed and may be worth discussing with your veterinarian.

Top choices

My pick by situation

• One cat, especially a senior cat or a cat with past urinary problems: PrettyLitter is probably the easiest choice because the health-monitoring feature is its main purpose.
• Multiple cats: A color-changing litter is less useful because you may not know which cat caused the change. Consider pairing it with a way to identify individual litter-box use.
• A cat that refuses crystal litter: Try a clumping health-monitoring option instead. Texture preference matters—some cats will avoid a litter they dislike.

Important limitations

• Blue/green does not automatically mean “UTI.” Urine pH can change for reasons including diet, hydration, and normal variation.
• Red or pink findings, straining, frequent trips to the box, crying while urinating, or producing little/no urine warrant prompt veterinary attention. Male cats with urinary blockage signs are an emergency.

If you tell me your cat’s age, sex, number of cats, current litter type (clay/clumping/crystal), and whether there is a history of UTIs or crystals, I can narrow down which one is likely to work best.