Comparison

Parallel Chronology vs WordUnlock study focus

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

Head to head
About

Parallel Chronology

Explore historical events and fictional timelines side-by-side. Compare information across different categories and time periods, from the dawn of the universe to the present and beyond. Discover new insights by juxtaposing diverse data points on an infinitely scrolling timeline.

Highlights
  • Side-by-side information display
  • Story units for comparative analysis
  • Infinite scroll timeline (99.9 billion BC to 99.9 billion AD)
  • Tool for historical discovery
  • Supports custom fictional data
  • Links to Wikipedia for details
  • Universal device support (iPhone/iPad)
Features
Read full description

## Parallel comparison ## You can display various informations with time attributes unit of year side by side, regardless of a specific category such as Japanese history or world history. ## Story Unit ## Multiple data are displayed together in a unit "Story", so you can easily compare informations along with different viewpoints. ## Almost infinite scroll ## You can display Informations from before the birth of the universe (13.8 billion years ago) to the present on the same timeline. It is almost infinite scroll by practical usage. It is about a range of 99.9 billion BC to 99.9 billion AD. ## Tool for new discovery ## Comparing historical figures of various countries, or history of natural disasters and wars, which may deepen your understanding of history or make new discoveries. ## It's OK on any data ## You can create Story and datas of it. It's OK not only data on history, but fictional datas such as in novels, movies, and completely original datas. ex. * History of characters in SF novels * Genealogy of ancestors * Data for memorization of historical terms ## Easy to check detail informations ## Each data on the chronology is linked to page of Wikipedia, so if its title exists, you can check the detail information immediately. This is the same even if it is data created by yourself. ## Universal devices ## This app supports universal devices, so you can use comfortably with either iPhone of iPad. In addition, you can rotate either horizontally or vertically. So you can rotate it according to your preference, for example in case you want to display a longer period, want to compare a lot of informations. This app is developed as you can use even if on 4-inch iPhone SE. If you will be using on large resolution device like iPad Pro, more comfortable.

About

WordUnlock study focus

Features
Read full description

Learn a few words before opening your favorite apps. Turn everyday screen time into a chance to learn. WordUnlock combines vocabulary learning with app restrictions. Limit access to selected apps, then answer vocabulary questions correctly in a row to unlock them for a set period of time. “I keep checking social media.” “I struggle to study vocabulary consistently.” Build a new habit: take a quick quiz before using your apps. 【Unlock Apps with Vocabulary Quizzes】 Choose the correct meaning of each word. Reach your target streak of correct answers to unlock your selected apps. Check the home screen to see how much unlocked time you have left. 【Create Your Own Word Lists】 Add words and their meanings to create personalized word lists. Review lessons, practice difficult vocabulary, and study what matters to you. You can edit your lists and add more words anytime. 【Listen and Learn】 Hear words read aloud to connect their spelling with their pronunciation. Choose from English, Japanese, Korean, Chinese, Spanish, and French for text-to-speech. 【Free Plan】 ・Restrict one app ・Answer 10 questions correctly in a row to unlock your app for 16 minutes ・Create and edit word lists ・Listen to words read aloud Please note: The free plan includes ads. 【Premium Plan】 ・Remove ads ・Restrict multiple apps ・Customize the number of consecutive correct answers needed to unlock apps ・Customize how long apps stay unlocked Premium is available as a monthly or annual subscription. See the in-app purchase screen for pricing. 【Great for Anyone Who Wants to】 ・Build a study habit before opening social media or games ・Cut back on excessive screen time ・Learn vocabulary in spare moments ・Practice regularly with personalized word lists Please note: Permission to access Screen Time is required to restrict apps. privacy policy:https://cumbersome-barberry-4a6.notion.site/WordUnlock-3d3af1de834d8080b1c1cfc290f0e2cf terms of service:https://cumbersome-barberry-4a6.notion.site/WordUnlock-3d3af1de834d804b9a50d253025cc7e5 apple standard license agreement(EULA):https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Parallel Chronology3 screens
WordUnlock study focus4 screens

Verdict

The call

The clearest difference is in-app purchases: Parallel Chronology at none against WordUnlock study focus's 2. WordUnlock study focus's advantage is update cadence (every 3 days vs every 9 months). On price, ads, device support and iOS requirement 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. WordUnlock study focus sells 2 in-app purchases, starting at $4.99 per month. Parallel Chronology asks for nothing beyond the download.

UpkeepUpdate frequency

Parallel Chronology ships an update every 9 months, WordUnlock study focus every 3 days. The most recent releases landed on November 7, 2026 and November 6, 2026 respectively.

Scorecard2 real differences · 8 level
Parallel Chronology versus WordUnlock study focus: the parameters behind the verdict, then further details
ParameterParallel ChronologyWordUnlock study focus
PriceFreeFree
Rating1.0 (1 ratings) — better—
Positive reviews64.3% of reviews—
Number of ratings1 — better—
Update frequencyEvery 9 monthsEvery 3 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.0 — better16
Further details — not scored
Size12 MB36 MB
Age rating4+4+
DeveloperNeusara LLCruki hamaguchi

In-app purchases

None

Parallel Chronology

No in-app purchases

2 purchases

WordUnlock study focus

Subscriptions2
  • Premium Plan (Monthly Renewal)$4.991 Month
  • Premium Plan (Annual Renewal)$36.991 Year

Questions

Is Parallel Chronology free?
Parallel Chronology is free to download, with no in-app purchases.
Is WordUnlock study focus free?
WordUnlock study focus is free to download, with in-app purchases available.
Do Parallel Chronology or WordUnlock study focus have ads?
Neither Parallel Chronology nor WordUnlock study focus shows ads.
Which is updated more often, Parallel Chronology or WordUnlock study focus?
Parallel Chronology ships an update every 9 months, and WordUnlock study focus every 3 days. Most recently, Parallel Chronology was updated on November 7, 2026 and WordUnlock study focus on November 6, 2026.

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