Best Interval Timer vs E1RM Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Best Interval Timer
This app acts as your personal coach, guiding you through workouts with customizable routines. Focus on your exercise while it manages timing for warm-up, high/low intensity intervals, cool-downs, and rest periods.
- Customizable workout routines
- Warm-up, intensity, cool-down, rest periods
- Background and multitasking support
- Adjustable interval sounds and vibrations
- Workout practice tracking
- Landscape and portrait orientation
Read full descriptionHide full description
This app is like your personal coach, just focus on your workout without having to worry about time, Best Interval Timer will lead you to finish them perfectly. There is one default routine in this free version, but you can edit it to your own one which include warm-up, high/low intensity, cool down and rest time etc, you can custom as many sets as you wish to do. Key Features: ⁃ One default routine. ⁃ Big readable counting down time. ⁃ Start, pause or reset routine. ⁃ Warm up, low intensity, high intensity, cool down, rest time. ⁃ Support background, foreground playing and multitasking. ⁃ Music plays. ⁃ Vibrate or not. ⁃ 15 interval switch sounds. ⁃ 12 background interval pictures available. ⁃ Show number of times you have practiced of one routine. ⁃ Support landscape and portrait. ⁃ Create one reminder to alert you doing your workout. ⁃ Supports universal version. If you have any question or suggestion, please send email to our support userfeed@vip.tom.com.
E1RM Calculator
Read full descriptionHide full description
E1RM Calculator is a powerful training tool for strength athletes. Using the scientifically-backed RPE (Rate of Perceived Exertion) method developed by Mike Tuchscherer and popularised by Barbell Medicine, it gives you accurate one rep max estimates and helps you plan complete training sessions. CALCULATE YOUR 1RM Enter the weight you lifted, the number of reps, and how hard it felt on the RPE scale. The app instantly estimates your one rep max using a precise lookup table that accounts for both rep count and perceived exertion. TRAINING PERCENTAGES See your estimated working weights at 95%, 90%, 85%, 80%, 75%, 70%, 65%, and 60% of your 1RM at a glance. Use the custom percentage calculator to find the weight for any percentage you need. SETS PLANNER Plan your full training session before you walk into the gym. Configure your opening set, then add follow-up sets using RPE targets, percentage reductions or increases, or specific weights. Generate your complete session and copy it to your clipboard to share or reference during training. FLEXIBLE SETTINGS Choose between kg and lbs. Configure weight rounding to match your available plates — round to the nearest 0.5 or 2.5, and choose whether to round up, down, or to the nearest increment. SIMPLE AND FOCUSED No account required. No ads. Works completely offline. Your settings are saved locally on your device.
Screenshots
Verdict
The clearest difference is in-app purchases: Best Interval Timer at none against E1RM Calculator's 1. E1RM Calculator's advantage is ads (none vs shown) and update cadence (every 8 days vs every 12 months). On price, device support and iOS requirement 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
Both are free to download. E1RM Calculator sells 1 one-off in-app purchase. Best Interval Timer asks for nothing beyond the download.
Best Interval Timer ships an update every 12 months, E1RM Calculator every 8 days. The most recent releases landed on October 11, 2026 and October 12, 2026 respectively.
| Parameter | Best Interval Timer | E1RM Calculator |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (81 ratings) — better | — |
| Positive reviews | 89.3% of reviews | — |
| Number of ratings | 81 — better | — |
| Update frequency | Every 12 months | Every 8 days — better |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 16.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 19 MB | 0 MB |
| Age rating | 4+ | 4+ |
| Developer | 倩 赵 | Paul Walsh |
Bugs and requests
Best Interval Timer
Reported bugs
7 issues- App stops working after rating notification
- Buttons don't work after rating notification
- Crashes when saving timers
- Crashes when editing exercises
- Freezes and stops working
Show 2 moreShow fewer
- Lost all timers after reinstalling
- Side view unusable
Requested features
10 requests- Ability to save multiple intervals/routines
- Voice cues for start/stop
- Apple Watch compatibility
- Larger buttons and text
- Option to save different schedules (e.g., Tabata)
Show 5 moreShow fewer
- Fix crashing when saving timers
- Fix crashing when editing exercises
- Improve side view usability
- Remove ads or reduce frequency
- Option to have cool down at the end of all intervals
E1RM Calculator
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Best Interval Timer
No in-app purchases
E1RM Calculator
- Support Developer$1.99
Questions
Is Best Interval Timer free?
Is E1RM Calculator free?
Do Best Interval Timer or E1RM Calculator have ads?
Which is updated more often, Best Interval Timer or E1RM Calculator?
Other comparisons















