Vekt is a simple iPhone and Apple Watch weight logger. It is cheaper and adds habit journals, which Trendline does not have. Trendline instead offers a trend that states its uncertainty, every reading kept with its provenance, and body-composition estimates from your scale kept in context. Neither company is affiliated with the other.
Trendline is an iPhone app that reads Apple Health. Vekt ("Weight Tracker - Vekt") is a different iPhone and Apple Watch app. Neither company is affiliated with the other.
First, the honest part
Vekt earned a following for simplicity. Its App Store listing promises that you can "log your weight instantly with your iPhone or Apple Watch", it stores weights in Apple Health, and its privacy label reads "Data Not Collected" (its App Store listing, checked October 2026). It supports losing, gaining, and maintaining, with a percent-out-of-range statistic for maintenance, and it pairs your weight with habit journals so you can spot patterns. It holds a 4.4-star average across about 290 ratings. Its most recent version, 4.5.0, is from February 2025.
Where the two apps genuinely differ
| Vekt | Trendline | |
|---|---|---|
| Logging | Manual entry on iPhone or Apple Watch | Manual entry on iPhone, plus weight, body fat %, and lean body mass from any app that writes them to Apple Health |
| Apple Health | Syncs weight, height, and BMI with Apple Health | Reads weight and composition; writes only after an explicit action for that exact operation |
| Trend | Weekly and monthly change charts and an estimated "true weight"; the method is not published | Statistical trend with explicit uncertainty; declines to conclude when evidence is sparse |
| Readings per day | Not documented | Every reading kept, with its time, source, and unit |
| Goals | Lose, gain, and maintain modes | Lose Weight, Build Lean, and Maintain as distinct phases, with a goal forecast |
| Body composition | Weight, height, and BMI | Calculated fat and lean mass from paired readings, plus manual entry for values Apple Health has no type for |
| Habits | Habit journals tied to weight changes | None |
| Devices | iPhone and Apple Watch | iPhone only |
| Price | Free download; $1.99/month, with annual plans listed at $6.49 and $9.99 (App Store listing, October 2026) | $0.99/week · $3.99/month · $10.99/year · $34.99 lifetime |
Vekt is cheaper, has an Apple Watch app, and offers habit journals; Trendline has none of those. What Trendline offers instead is a trend that states its uncertainty, every reading kept with its provenance, and body-composition estimates from your scale kept in context, so the picture includes more than weight and BMI. The full math is public on the methodology page.
Who should pick which
- Pick Vekt if logging from your Apple Watch matters, you want habit journals next to your weight, or you want the lower price.
- Pick Trendline if your scale writes body-fat or lean-mass readings to Apple Health and you want them read in context, you keep several readings a day, or you want the trend to admit uncertainty.
Try the idea
Paste a few weeks of weigh-ins into the free weight trend calculator to see a slower signal drawn against every reading, in your browser, before you install anything.
Questions people ask
What is Vekt?
Vekt ("Weight Tracker - Vekt") is an iPhone and Apple Watch app. Its App Store listing promises that you can "log your weight instantly with your iPhone or Apple Watch".
Does Vekt work with Apple Health?
Yes. It syncs weight, height, and BMI with Apple Health. Trendline reads weight and composition from Apple Health and writes only after an explicit action for that exact operation.
Is Vekt cheaper than Trendline?
Yes. Vekt is a free download with a $1.99/month plan and annual plans listed at $6.49 and $9.99 (App Store listing, October 2026). If you want the lower price, pick Vekt.
When was Vekt last updated?
Its most recent version, 4.5.0, is from February 2025 (App Store listing, checked October 2026).
Does Vekt track body composition?
Vekt covers weight, height, and BMI. Trendline calculates fat and lean mass from paired readings and accepts manual entry for values Apple Health has no type for.
Sources
Trendline is not affiliated with or endorsed by Vekt or ComQuark Advanced Technology Solutions LLC. Facts above were verified against the linked page on October 3, 2026; app stores change, so check the listing for current pricing.