Comparison

Bould vs TetherSwim

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

Head to head
About

Bould

Features
Read full description

CLIMB WITH PURPOSE You send plenty of problems in a session. But are they the ones you meant to send? Did you finish that project? Get back on the slab you always skip? Or did you just wander around… then walk out unsure if you actually got better? That's why this simple indoor bouldering app was created. --- LOG EVERY ATTEMPT WITH A SWIPE • Left = fail • Right = send • Then rate the quality It's faster than grabbing your chalk between each attempt. Forget pen and paper. Forget messy notes on your phone. Forget waiting for your gym to have its own system. This works anywhere. --- TURN CHAOS INTO STRUCTURE • Save views for warm-ups, technique climbs, or projects • Filter and sort by grade, area, attempts, quality, and more • Always know which problems to hit next — no more guessing, no more forgetting • Add structure without feeling restricted by rigid training plans made for athletes (keep climbing fun!) --- SEE PROGRESS YOU CAN FEEL Grades are good. But better footwork? Fewer fails? Smoother sends? That's real progress — and you’ll see it all in your charts. Motivation built in. --- WHY CLIMBERS ARE SWITCHING • Works in any gym (supports multiple gyms & colour systems) • Built for indoor bouldering only • Your private logbook, not a social feed • Simple, clean design that stays out of your way If you'd never hit the weight room or running track without a plan... why climb without one? Download now and make every send count. --- Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

TetherSwim

This app accurately tracks swimming workouts performed with resistance cords or endless pools, overcoming the limitations of traditional trackers. It estimates distance based on stroke count and efficiency, providing comprehensive workout data.

Highlights
  • Accurate distance estimates
  • Automatic SWOLF tracking
  • Full workout data (calories, heart rate)
  • Exclude test swims
  • Strava integration
  • Automatic Water Lock mode
Features
Read full description

TetherSwim is built for swimmers training with resistance cords, swim tethers, or endless pools. Traditional swim trackers can struggle with these sessions, giving you wildly inaccurate distances or ignoring your efforts altogether. With TetherSwim, your distance is estimated intelligently based on your real stroke count, SWOLF, and previous swim history — all from your Apple Watch. Features: • Accurate distance estimates – Uses your stroke rate, efficiency, and past workouts to calculate real swim distance. • Automatic SWOLF tracking – Measures your swim efficiency in tethered conditions. • Calories, heart rate, and more – Full workout data, just like in regular pool swims. • Exclude test swims – Keep your baselines clean by excluding warm-ups or experiments. • Strava integration – Upload your tethered swim sessions directly. • Water Lock mode – Automatically engages when you start, so your watch screen won’t go crazy mid-session.

Screenshots

Bould4 screens
TetherSwim3 screens

Verdict

The call

The clearest difference is in-app purchases: TetherSwim at none against Bould's 2. TetherSwim also leads on ads (none vs shown). Bould's advantage is update cadence (every 2 days vs every 2 weeks) and iOS requirement (15.1 vs 18.5). On price 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Bould sells 2 in-app purchases, starting at $1.99 per month. TetherSwim asks for nothing beyond the download.

UpkeepUpdate frequency

Bould ships an update every 2 days, TetherSwim every 2 weeks. The most recent releases landed on October 12, 2026 and October 10, 2026 respectively.

Scorecard4 real differences · 5 level
Bould versus TetherSwim: the parameters behind the verdict, then further details
ParameterBouldTetherSwim
PriceFreeFree
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyEvery 2 days — betterEvery 2 weeks
AdsYesNo — better
In-app purchasesYesNo — better
Monetization—Free
DevicesiPhone, iPad, iPod — betteriPhone, Apple Watch
Requires iOS15.1 — better18.5
Further details — not scored
Size54 MB15 MB
Age rating4+4+
DeveloperSIOBHAN FRANCES JAMES-LYNNPatrick Biggin

In-app purchases

2 purchases

Bould

Subscriptions2
  • Unlimited access1 Month trial$1.991 Month
  • Unlimited access1 Month trial$14.991 Year
None

TetherSwim

No in-app purchases

Questions

Is Bould free?
Bould is free to download, with in-app purchases available.
Is TetherSwim free?
TetherSwim is free to download, with no in-app purchases.
Do Bould or TetherSwim have ads?
Bould shows ads; TetherSwim does not.
Which is updated more often, Bould or TetherSwim?
Bould ships an update every 2 days, and TetherSwim every 2 weeks. Most recently, Bould was updated on October 12, 2026 and TetherSwim on October 10, 2026.

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