Comparison

Base Builder vs TachyMon

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

Head to head
About

Base Builder

Receive timely heart rate alerts and audio cues to stay within your target workout effort. Integrates with the Health app, providing detailed voice feedback on distance, pace, and heart rates. Haptic alerts notify you when you exceed heart rate limits.

Highlights
  • Heart rate alerts
  • Audio cues for distance and pace
  • Haptic feedback for heart rate limits
  • Health app integration
  • Customizable workout statistics announcements
Read full description

Base Builder provides you with timely heart rate alerts and audio cues to help you maintain your target workout effort. Workouts are integrated into the Health app. Voice alerts provide detailed information regarding your distance, pace, and heart rates. Haptic alerts notify you when you have exceeded your heart rate limit. Feedback is constant until your heart rate is below your configured limit. Distance triggered audio cues let you configure the workout statistics that are announced to you. Workout statistics include distance, heart rate, and pace.

About

TachyMon

Receive immediate alerts for significant heart rate fluctuations, ideal for conditions like POTS or during exercise. Customize thresholds and receive detailed event tracking. Premium features offer advanced data visualization and reporting.

Highlights
  • Customizable heart rate threshold alerts
  • Haptic feedback for alerts
  • Real-time heart rate and average display
  • Alert event tracking and logging
  • Temporary alert silencing
  • Detailed monitoring data review
  • Shareable PDF reports (premium)
Features
Read full description

Get rapid alerts for significant heart rate changes due to POTS, tachycardia, exercise or other activities. Features: - Haptic alerts based on custom threshold levels. - Customizable upper and lower threshold levels for current heart rate and difference from recent average. - The main display shows: current heart rate, moving average of recent heart rate, and delta of current heart rate to average. - Display colors change to show severity of alert. - The app tracks alert events with start time of event, event duration, starting average heart rate, and maximum or minimum heart rate during event. - Triple tap to temporarily silence alerts. - Review detailed monitoring data on the companion iPhone app. Premium features: - View detailed heart rate chart for each event - Share event info directly from watch, or export from iPhone to Photos app - Run monitoring sessions directly on your iPhone, without an Apple Watch, by connecting a Bluetooth heart rate sensor - Generate a shareable PDF report for each session - Add notes and symptoms to Alert Events - Export Alert Event raw heart rate data to .csv - View live session data on the iPhone companion app - View a summary of Alert Events over last week / month / year TachyMon was created by the developer for his niece Alex, who was diagnosed with Postural Orthostatic Tachycardia Syndrome (POTS) in the fall of 2021. Alex was experiencing frequent fainting, and her family noticed the episodes often followed a rapid rise in her heart rate. She wanted a heads-up the moment that started happening. Alex uses TachyMon's alerts as a cue to sit or crouch down when her heart rate climbs quickly, and she finds the app helps her feel a bit more in control of her day. It is a simple but specialized app, and we hope it may help others with POTS, or anyone who wants to be alerted to changes in their heart rate. APPLE HEALTH TachyMon integrates with the Apple Health app. TachyMon stores workout information (including heart rate) with the Apple Health app. WARNING: It is important to consult with medical professionals if you are concerned about your health. The TachyMon app is intended for informational purposes only. It is not a substitute for specialized medical care. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

TachyMon4 screens

Verdict

The call

The clearest difference is in-app purchases: Base Builder at none against TachyMon's 2. Base Builder also leads on update cadence (monthly vs every 3 months) and iOS requirement (13.0 vs 16.4). TachyMon's advantage is rating (3.8 vs 3.4) and review sentiment (58% vs 33%). 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. TachyMon sells 2 in-app purchases, starting at $2.99 per month. Base Builder asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

TachyMon holds the better App Store score, 3.8 against 3.4. That said, the two scores are not equally well evidenced: TachyMon has 286 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 33% of Base Builder's written reviews are positive against 58% of TachyMon's.

UpkeepUpdate frequency

Base Builder ships an update monthly, TachyMon every 3 months. The most recent releases landed on September 30, 2026 and October 12, 2026 respectively.

Scorecard7 real differences · 3 level
Base Builder versus TachyMon: the parameters behind the verdict, then further details
ParameterBase BuilderTachyMon
PriceFreeFree
Rating3.4 (7 ratings)3.8 (286 ratings) — better
Positive reviews33.3% of reviews57.6% of reviews — better
Number of ratings7286 — better
Update frequencyMonthly — betterEvery 3 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPod, Apple Watch — betteriPhone, Apple Watch
Requires iOS13.0 — better16.4
Further details — not scored
Size2 MB36 MB
Age rating4+9+
DeveloperDouglas CurtisWhip Development Inc.

Customer experience

Base Builder

All ratings7 ratings
Positive57.1%
Neutral0.0%
Negative42.9%
Written reviews3 reviews
Positive33.3%
Neutral0.0%
Negative66.7%

TachyMon

All ratings286 ratings
Positive69.2%
Neutral5.2%
Negative25.5%
Written reviews205 reviews
Positive57.6%
Neutral13.2%
Negative29.3%

Bugs and requests

Base Builder

Not enough reviews yet to summarise bugs or requests.

TachyMon

Reported bugs

4 issues
  • Frequent disconnections from heart rate monitor
  • Inconsistent data sync between watch and phone
  • Inability to reinstall app on new devices
  • Freezing and crashing issues on latest updates

Requested features

5 requests
  • Add ability to log symptoms and notes
  • Implement emergency contact alerts
  • Improve data export and sharing options
  • Enhance graphing and trend analysis tools
  • Optimize battery usage and background monitoring

In-app purchases

None

Base Builder

No in-app purchases

2 purchases

TachyMon

Subscriptions2
  • TachyMon Premium Monthly1 Month trial$2.991 Month
  • TachyMon Premium Annual1 Month trial$19.991 Year

Questions

Is Base Builder free?
Base Builder is free to download, with no in-app purchases.
Is TachyMon free?
TachyMon is free to download, with in-app purchases available.
Which has better reviews, Base Builder or TachyMon?
TachyMon is rated higher. Base Builder averages 3.4 out of 5 from 7 ratings, while TachyMon averages 3.8 from 286 ratings.
Do Base Builder or TachyMon have ads?
Neither Base Builder nor TachyMon shows ads.
Which is updated more often, Base Builder or TachyMon?
Base Builder ships an update monthly, and TachyMon every 3 months. Most recently, Base Builder was updated on September 30, 2026 and TachyMon on October 12, 2026.

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