Comparison

OnceOne vs Loopless GTD

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

Head to head

OnceOne

Smart filter & grouping tasks.

About

OnceOne

Features

Read full description

With OnceOne, you can manage your to-do tasks offline or on multiple devices through iCloud. We provide a powerful filter function to help you quickly locate the task list that meets specific conditions. ## Core Features - To-do management - Custom filter list - Tomato countdown focus - Activity records - Data statistics and chart display Privacy policy: https://yindongliang.com/docs/App/OnceOne-Privacy-Policy/ Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Loopless GTD

Features

Read full description

Loopless aims to be the perfect app for GTD, base on David Allen's concept to capture, organize, process, track, and review your open loops.

Screenshots

OnceOne3 screens

Loopless GTD4 screens

Verdict

The call

The clearest difference is in-app purchases: Loopless GTD at none against OnceOne's 3. Loopless GTD also leads on update cadence (every 3 days vs weekly) and iOS requirement (13.0 vs 18.0). 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. OnceOne sells 3 in-app purchases, starting at $0.99 per month. Loopless GTD asks for nothing beyond the download.

UpkeepUpdate frequency

OnceOne ships an update weekly, Loopless GTD every 3 days. Both last shipped on September 5, 2026.

Scorecard3 real differences · 3 level

OnceOne versus Loopless GTD: the parameters behind the verdict, then further details
Parameter	OnceOne	Loopless GTD
Price	Free	Free
Update frequency	Weekly	Every 3 days — better
Ads	No	No
In-app purchases	Yes	No — better
Devices	iPhone, iPad	iPhone, iPad, iPod — better
Requires iOS	18.0	13.0 — better
Further details — not scored
Size	3 MB	176 MB
Age rating	4+	4+
Developer	Dongliang Yin	Shubhi Jain

In-app purchases

3 purchases

OnceOne

Subscriptions2

Pro(Monthly)$0.991 Month
Pro(Annual)$9.991 Year

One-time1

Pro(Lifetime)$24.99

None

Loopless GTD

No in-app purchases

Questions

Is OnceOne free?

OnceOne is free to download, with in-app purchases available.

Is Loopless GTD free?

Loopless GTD is free to download, with no in-app purchases.

Do OnceOne or Loopless GTD have ads?

Neither OnceOne nor Loopless GTD shows ads.

Which is updated more often, OnceOne or Loopless GTD?

OnceOne ships an update weekly, and Loopless GTD every 3 days. Most recently, OnceOne was updated on September 5, 2026 and Loopless GTD on September 5, 2026.