Comparison

Stop Nail Biting vs Scull.fit

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Stop Nail Biting

This app helps you quit nail biting through guided awareness exercises. It focuses on noticing sensations to reduce automatic urges, requiring just one minute of practice twice daily. Track your progress with streaks and build a healthier relationship with your hands.

Highlights
  • Guided curiosity sessions
  • Daily awareness practice
  • Supportive reminders
  • Streak tracking
  • No guilt or shame approach
  • Science-inspired habit rewiring
Features
Read full description

Stop biting your nails — without willpower, bitter polish, or guilt. Calm Nails is a simple, science-inspired habit app built around one idea: awareness rewires automatic behavior. Instead of fighting urges, you’ll practice short guided “curiosity sessions” that help you notice sensations in your hands and nails—so the impulse loses its grip over time. It’s not a panic button. It’s a tiny daily practice that retrains your brain. How Calm Nails Works 1 minute, twice per day. Do a short Morning Session and Evening Session Follow gentle guidance to explore sensations (pressure, tingling, texture, tension) Learn to pause without force, and let the urge pass naturally With consistency, nail-biting becomes less automatic—and easier to stop for good. What You’ll Love Cure with Curiosity Build a new relationship with your hands through calm attention. No punishment. No shame. Just noticing. Daily Reminders (supportive, not pushy) Set your preferred times and let Calm Nails nudge you back to your practice—without guilt or pressure. Streaks & Consistency Tracking Stay motivated with simple streak tracking designed to keep the habit lightweight and doable. No Gimmicks No bitter polish. No “just stop.” No shame spirals. Calm Nails is built for real humans. Realistic Results Most people notice the urge softening within 1 week with steady practice. Consistency matters more than perfection—even small sessions count. Use Calm Nails free for 14 days, then keep going with a one-time purchase or a monthly plan. Terms of Use: https://www.calmnails.com/terms https://www.apple.com/legal/internet-services/itunes/dev/stdeula

About

Scull.fit

Read full description

No external account or customer/personal data is stored by Scull.fit. All data is currently stored on the user's device and the device only. Scull.fit turns your Concept2 PM5 into a smart coach. Connect via Bluetooth and get real-time metrics, technique feedback, and guided workouts — all on your iPhone. LIVE METRICS See pace, watts, stroke rate, heart rate, calories, and distance update in real time. Tap any metric to maximise it. Long-press to set a target — the tile flashes green when you're on pace, red when you're off. TECHNIQUE BADGES Five badges track the quality of your rowing, not just the output: • Stroke Power — watts per stroke • Rhythm — drive-to-recovery ratio • Force Curve — force effectiveness through the drive • Consistency — stroke rate variation • Cardio Power — watts per heartbeat (with HR monitor) Each badge levels up from 1 to 3 during your row. Hit Level 3 and a celebration flash fires across the screen. HYROX MODE A dedicated 1000m row with guided coaching cues. Scull.fit tells you when to get on pace, when to drive, when to settle, and when to sprint the final 100m. Pace targets are set automatically as you row. INTERVALS Build any interval workout — fixed distance or fixed time, with configurable rest periods. Set a different pace target per interval. Save your favourites as presets for one-tap access. CHASE YOUR PBs Finished a great row? Swipe to Chase it. Scull.fit loads your previous targets and shows a pace boat so you can race yourself. STATS & SCORES Track your progress across six performance dimensions: Power, Efficiency, Technique, Consistency, Endurance, and Cardio. Spider charts and trend lines show how you're improving over time. SPLITS & CHARTS Every workout saves detailed splits, pace curves, stroke rate graphs, watts charts, and heart rate data. Tap any chart to view it full-screen with pinch-to-zoom. CONCEPT2 LOGBOOK Sync your workouts with the official Concept2 Online Logbook to keep your lifetime metres up to date. WORKS WITH • Concept2 RowErg (PM5) • Concept2 BikeErg (PM5) • Concept2 SkiErg (PM5) • Any Bluetooth heart rate monitor Scull.fit is built by rowers, for rowers. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://scull.fit/privacy.html

Screenshots

Stop Nail Biting4 screens
Scull.fit4 screens

Verdict

The call

The clearest difference is in-app purchases: Scull.fit at none against Stop Nail Biting's 5. Scull.fit also leads on iOS requirement (16.0 vs 18.2). On price there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Stop Nail Biting sells 5 in-app purchases, starting at $3.99 per month. Scull.fit asks for nothing beyond the download.

Scorecard2 real differences · 8 level
Stop Nail Biting versus Scull.fit: the parameters behind the verdict, then further details
ParameterStop Nail BitingScull.fit
PriceFreeFree
Rating5.0 (10 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings10 — better—
Update frequencyMonthly—
AdsNo—
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone — better—
Requires iOS18.216.0 — better
Further details — not scored
Size24 MB7 MB
Age rating+44+
DeveloperPhil StarkovichScatterLab (Pty) Ltd

In-app purchases

5 purchases

Stop Nail Biting

Subscriptions3
  • Commit to Quit - Monthly$3.991 Month
  • Commit to Quit - Monthly w/ Trial3 Days trial$3.991 Month
  • Commit to Quit (Annual)$19.991 Year
One-time2
  • Commit to Quit - Lifetime (Special)$9.99
  • Commit to Quit (Lifetime)$19.99
None

Scull.fit

No in-app purchases

Questions

Is Stop Nail Biting free?
Stop Nail Biting is free to download, with in-app purchases available.
Is Scull.fit free?
Scull.fit is free to download, with no in-app purchases.

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