NLE Calc vs Chess Clock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
NLE Calc
This utility calculates the Recommended Weight Limit (RWL) and Lifting Index (LI) for single or multiple lifting tasks based on the NIOSH Lifting Equation. It helps assess physical stress to prevent low back musculoskeletal disorders.
- Calculates Recommended Weight Limit (RWL)
- Calculates Lifting Index (LI)
- Calculates Composite Lifting Index (CLI)
- Based on Revised NIOSH Lifting Equation
- Assesses physical stress for lifting tasks
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The NIOSH Lifting Equation calculator (NLE Calc) is based on the Applications Manual for the Revised NIOSH Lifting Equation (Pub No. 94-110) and can be used to calculate the Recommended Weight Limit (RWL) and for single or multiple lifting tasks. The Lifting Index (LI) is an index of the relative physical stress for performing a single lifting task and the Composite Lifting Index (CLI) is an index of the overall physical stress for performing multiple lifting tasks. NIOSH recommends an LI and a CLI of 1 or less for protecting workers from physical stress related to development of low back musculoskeletal disorders. Please refer to the Applications Manual for the Revised NIOSH Lifting Equation publication for examples and details on how calculations are performed and what the results imply.
Chess Clock
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The most beautiful chess clock on iPhone. Tempo is a native, drift‑free chess clock built for modern iOS. One‑tap simple for a casual game between friends; tournament‑accurate when it counts. No ads. No clutter. Just a gorgeous clock that keeps honest time. ► FREE, AND FAIR Both players always get an accurate, mute‑able clock — free, forever. Count down to the flag, or switch to Count Up and run each side as a stopwatch. Play, pause, reset. That’s the whole game, and none of it is behind a paywall. ► DRIFT‑FREE PRECISION Most clock apps slowly drift and lose time — fatal in blitz. Tempo derives every reading from the phone’s monotonic clock, so the time is always correct to the millisecond. Tenths of a second kick in automatically under 20s. ► EVERY TIME CONTROL Presets from Bullet to Classical, plus the full competitive spectrum: Fischer increment, Bronstein, Simple Delay, and Hourglass. Build and save your own — including asymmetric handicap times for uneven matchups and coaching. ► SEVEN LIVING CLOCK FACES Not recolors — full renderers, each with its own digits, motion, and time‑trouble behavior: Minimal, LED, Flip split‑flap, Analog with a real falling flag, Nixie tubes, Pixel dot‑matrix, and the gilded Grandmaster (with its own boom‑bap sound). Switch anytime with live previews. ► HANDS‑FREE & ACCESSIBLE Spoken countdowns (“one minute… ten… flag”) and per‑move readback let you play without looking. Pick any voice installed on your phone. A genuine accessibility win — and nobody else in the category ships it. ► LIVE ON YOUR LOCK SCREEN The active clock ticks in the Dynamic Island and on the Lock Screen, so you can follow the game without keeping the app open. ► BUILT TO BE TRUSTED The screen stays awake all game. It auto‑pauses if you leave the app and reconciles the time perfectly. Reset needs a deliberate confirm mid‑game, so a stray tap never wipes your position. ► HAPTIC & SOUND A satisfying thump on every turn, a warning when a side drops low, and an alarm on the flag. Turn any of it off — for free. ► HISTORY & STATS Every finished game is logged: winner, time control, moves, duration — with win splits and averages. Not just for chess: Tempo is a perfect timer for Go, Shogi, Scrabble, backgammon, and debate. —— TEMPO PRO (optional, one‑time unlock) The clock is free. Pro adds all seven faces, the Bronstein/Delay/Hourglass modes, live add/remove‑minutes, unlimited custom controls, and spoken time.
Screenshots
Verdict
The clearest difference is in-app purchases: NLE Calc at none against Chess Clock's 1. NLE Calc also leads on iOS requirement (12.0 vs 17.0). Chess Clock's advantage is update cadence (every 5 days vs fortnightly). On price, ads and device support 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. Chess Clock sells 1 one-off in-app purchase. NLE Calc asks for nothing beyond the download.
NLE Calc ships an update fortnightly, Chess Clock every 5 days. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.
| Parameter | NLE Calc | Chess Clock |
|---|---|---|
| Price | Free | Free |
| Rating | 2.8 (10 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 10 — better | — |
| Update frequency | Fortnightly | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 12.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 62 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Centers For Disease Control and Prevention | Dmitry Kalashnikov |
In-app purchases
NLE Calc
No in-app purchases
Chess Clock
- Tempo Pro$4.99
Questions
Is NLE Calc free?
Is Chess Clock free?
Do NLE Calc or Chess Clock have ads?
Which is updated more often, NLE Calc or Chess Clock?
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