Comparison

Tetra vs FormCheck+

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

Head to head
About

Tetra

This app guides you through box breathing exercises using subtle haptic feedback. It helps you slow down, focus, and reset your nervous system with a distraction-free design. Enjoy quick sessions anytime without sound or sign-ups.

Highlights
  • Adjustable breathing rhythm
  • Subtle haptic feedback
  • Minimalist design
  • Silent mode compatibility
  • One-tap start
Read full description

Tetra guides box breathing with a simple animation. Let the movement of the orb guide you through inhale, hold, exhale, and hold, at a pace you choose. Use it for a short pause between meetings, as part of a bedtime routine, or whenever you want to spend a few minutes on your breathing. CHOOSE YOUR RHYTHM Start with the standard 4-4-4-4 pattern, or choose Beginner (3-3-3-3), Focus (5-5-5-5), or Calm (6-6-6-6). Custom timing lets you set each phase from 2 to 10 seconds. Switch rhythms from the main screen without opening Settings. SET YOUR SESSION LENGTH Choose a number of cycles, a duration in minutes, or an open-ended session. Timed sessions finish the cycle in progress so they don't stop halfway through a breath. FOLLOW THE MOVEMENT The orb expands on the inhale and settles on the exhale. A four-part indicator shows where you are in the cycle. Haptic feedback follows each phase, with optional audio cues if you prefer them. The dark interface keeps the focus on the orb. KEEP A SESSION RECORD Review your sessions by day, with totals for sessions, minutes, and cycles. With your permission, Tetra can also save completed sessions to Apple Health as Mindful Minutes. Set an optional daily reminder for a time that suits you. ACCESSIBILITY Tetra supports VoiceOver with phase announcements, Reduce Motion, Differentiate Without Color, and Dynamic Type. LANGUAGES Tetra follows your device's language setting. Available in English, Turkish, Spanish, German, French, Brazilian Portuguese, Italian, Japanese, Simplified Chinese, and Korean. PRIVACY Tetra is free, with no ads, subscriptions, account, analytics, or tracking. Your session history stays on your device. Apple Health logging requires your permission, and Tetra does not read your Health data. Privacy policy: https://tetraapp.carrd.co/ Tetra is not a medical device. If you have a respiratory or cardiovascular condition, consult a healthcare professional before starting new breathing exercises.

About

FormCheck+

This app provides AI-powered analysis of your workouts and form, offering corrective exercises and safety feedback. Track progress with photos, measurements, and PRs, and receive personalized workout plans and insights into muscle engagement.

Highlights
  • AI verbal analysis and corrective exercises
  • Progress photo and body measurement tracking
  • Fitness goal checklist and PR dashboard
  • Cardio and workout logging
  • AI coaching chat for analysis breakdown
  • Technique checklist and gear suggestions
  • Muscle dashboard and smart training calendar
Features
Read full description

More than just checking your form and your lifts. With FormCheck+ you can upload progress photos, monitor body weight and body measurements, track your fitness goals with a checklist and PR dashboard, log cardio and workouts, and receive comprehensive verbal AI analysis feedback that includes corrective exercises to improve your lifts, areas for improvement with safety concerns and risk assessment, AI coaching chat to further break down your analysis and decipher why you received a certain score, technique checklist to hone in on lifting cues, and recommended lifting gear suggestions to enhance your performance. Whether you're a powerlifter, bodybuilder, CrossFit enthusiast, avid runner, just into general fitness, a beginner, intermediate, or advanced lifter, this app is for you. It checks all the boxes and offers something for everyone. Other app features include: -Earn points and badges for tracking and milestone achievements - Generate AI workout plans catered to your training goals - Transformation photo progress with AI feedback - Side-by-side video and photo comparison analysis - View neglected muscle groups and overworked body parts on the muscle dashboard - Utilize the smart training calendar for suggested muscle groups and rest days - No more math calculations to determine how to load the bar with plates with the built-in plate calculator in workout tracking - Record and track personal records, 1 rep maxes, and form analysis progression - Community challenges - Create a workout schedule for the week - Don't guess your warm-up, plan a 5-minute warm-up routine before attempting compound lifts to avoid injury - Generate, download, and print an ebook analysis with a comprehensive breakdown of your data and progress over time Privacy and Security Your data and numerical input will be processed by third-party AI services like OpenAI from the Base44 system that the app was created from to produce and generate your responses in the app. Data is shared with this provider for processing only and cannot be accessed by other users, the app's creator/admin, or any other entity or person. Your data, photos, and video analysis, as well as any other information you generated or uploaded, remain private, protected, and secure, and viewable only in your creator or user account. Should you choose to delete your account, all of your data will be permanently deleted. You may permanently delete your user account in settings located at the top right corner of the home page. The full privacy policy for FormCheck+ can be viewed and read here: https://doc-hosting.flycricket.io/formcheck-privacy-policy/22961b0a-a3d1-46db-88cb-4d9ed6a71950/privacy

Screenshots

Tetra3 screens
FormCheck+4 screens

Verdict

The call

The clearest difference is price: Tetra at Free against FormCheck+'s $1.99. FormCheck+'s advantage is device support (3 vs 1) and iOS requirement (15.1 vs 17.0). On rating, review sentiment, ratings volume and ads 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

Tetra is free to download; FormCheck+ costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Tetra against 5.0 for FormCheck+. Both are backed by a comparable volume of ratings — 2 and 1 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Scorecard4 real differences · 6 level
Tetra versus FormCheck+: the parameters behind the verdict, then further details
ParameterTetraFormCheck+
PriceFree — better$1.99
Rating5.0 (2 ratings)5.0 (1 ratings)
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings2 — better1
Update frequencyEvery 13 months—
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS17.015.1 — better
Further details — not scored
Size3 MB194 MB
Age rating4+12+
DeveloperEric SeitzDana Hallock

Customer experience

Tetra

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

FormCheck+

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Tetra

No in-app purchases

None

FormCheck+

No in-app purchases

Questions

Is Tetra free?
Tetra is free to download, with no in-app purchases.
Is FormCheck+ free?
FormCheck+ costs $1.99, with no in-app purchases.
Which has better reviews, Tetra or FormCheck+?
Tetra and FormCheck+ are both rated 5.0 out of 5 on the App Store, from 2 and 1 ratings respectively.
Do Tetra or FormCheck+ have ads?
Neither Tetra nor FormCheck+ shows ads.

Other comparisons