ErgSwap vs Cardio Convert
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ErgSwap
Easily convert cardio workouts between different machines. Input your intended exercise and distance/calories, and get equivalent efforts for running, rowing, skiing, and biking. Supports various models and units, with options for scaled or flat conversions.
- Convert workouts between machines
- Supports running, rowing, skiing, and biking
- Handles distance and calorie inputs
- Provides machine-specific units
- Offers scaled and flat conversion options
- Share workout conversions
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Programmed for one machine, stuck with another? The whiteboard says row 1,000 m and every rower is taken. Or your knee isn't up to running today. Or your gym simply doesn't own a SkiErg. ErgSwap tells you what to do instead: the equal-effort piece on whatever cardio is actually free. Enter the workout as it was written. Read the answer off every other machine in the gym. One number per row, in the unit that machine's console actually shows. HOW IT WORKS • Tap the machine the workout was programmed for, enter the distance or calories, and every other machine's equivalent appears at once. • Tap any result to turn it around. Decide to row instead and ErgSwap re-converts everything from 500 m row. • Quick-entry presets for the amounts you use most — a distance ladder and a calorie ladder, whichever matches what you're entering — or step the amount up and down. Set your own presets in Settings. • Share the whole answer as plain text. One tap sends every machine's equivalent to the group chat, in a message any app can display. • Help is one tap away on the main screen, with a search field and pictures of exactly what to tap. EVERY ERG IN THE GYM • Run — track, road, or curved treadmill • Concept2 RowErg and Rogue Echo Rower • Concept2 SkiErg and Rogue Echo SKI • Concept2 BikeErg • Rogue Echo Bike • Assault AirBike Turn off whatever your gym doesn't have and it disappears from the list. THE RIGHT UNITS, PER MACHINE Each machine reads in what its own console shows, so the number on your phone is the number you dial in. Meters on the ergs. Miles on the air bikes — but calories first, because calories are how air bikes get programmed. "20 cal Echo" is the workout; nobody rides an Echo to 0.54 mi. The Echo and the Assault are tracked separately, not lumped together as one "air bike." The Echo is meaner — roughly 30% fewer calories for the same effort — and rounding that away would cost you a minute on the clock. WOMEN'S AND MEN'S COLUMNS The published conversions differ by column, and the gap is real: a 400 m run is 400 m of rowing on one and 500 m on the other. ErgSwap starts with both, paired on every row the way the printed chart does — "400 / 500 m", women's first — so a coach can read one screen for a mixed class. Reading just your own number is one tap: the selector sits right on the results card — women's, both, or men's — and every number follows it. SCALED OR FLAT • Scaled follows the published chart, which compresses back toward running over longer pieces. This is the one you want at 5 k. • Flat uses a single ratio per machine — 400 m run ≈ 500 m row ≈ 1,000 m BikeErg. Easy to do in your head, but it overshoots past about a mile, and ErgSwap tells you the moment that starts to matter. Built on CrossFit Affiliate Programming's published cardio conversion charts, transcribed exactly and shown as published. No account. No ads. No subscription. No tracking. Every conversion is worked out on your iPhone; the only thing the app sends is optional, anonymous usage stats (which features get used, and what you search for in Help), and those are off with one tap in Settings.
Cardio Convert
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Can't run today? Cardio Convert turns any aerobic piece into its equivalent on another machine or movement in one tap. Type any distance, calorie count, rep count, or time and get the matching numbers for everything else instantly: - Run - Row / Ski erg - Bike erg - C2 erg calories - Air bike calories - Shuttle runs - Double unders - Burpees - Time domain Built by Fitness Academy on the conversion standards used across major functional fitness programs, and matched to published scaling charts cell for cell. FEATURES - Convert from any field: enter what you know, read off what you need - One-tap quick selects for common distances from 100m to 10K - Male and female machine calibration - Full reference table for every standard distance - Double under substitutions: jumping jacks, single unders, line hops, pogo jumps - No-equipment mode: time-matched rep targets for burpees, tuck jumps, lunges, squats, jacks, and high knees - Works fully offline, no account, no ads, no tracking Guidelines, not exact equivalents. Built around moderate to hard effort inside a workout. Match the time domain and intensity the workout is asking for; the tool is interchangeable, the stimulus isn't.
Screenshots
Verdict
The clearest difference is device support: Cardio Convert at 3 against ErgSwap's 1. Cardio Convert also leads on iOS requirement (15.1 vs 18.0). On price, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | ErgSwap | Cardio Convert |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 10 days | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 18.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 4 MB | 21 MB |
| Age rating | 4+ | 4+ |
| Developer | STEPHEN P JOHNSTON | Click Statement Inc |
In-app purchases
ErgSwap
No in-app purchases
Cardio Convert
No in-app purchases









