Comparison

Arca.so vs Folio Field Journal

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

Head to head
About

Arca.so

Browse and organize online content to discover inspiring and empowering information. Connect with others, gain new perspectives, and find unique voices. Make the internet a personalized space for your interests.

Highlights
  • Browse and curate internet content
  • Discover inspiring and empowering information
  • Connect with other users' perspectives
  • Gain new insights and find unheard voices
  • Personalize your internet experience
Read full description

Arca is your portal for browsing and curating the internet. Each piece you curate teaches Arca to intuitively guide you to content that informs, empowers, and inspires. Connect with others’ minds, see through different lenses, and discover unheard voices. Make the internet feel yours.

About

Folio Field Journal

Features
Read full description

The world waits to meet you. Folio is an app for the moments you didn't plan: the bird on your fence, the wildflower by the curb, the lizard on a sun-warm stoop. It's an app for noticing. NOT AN ANSWER. A KEEPSAKE. Other apps tell you what something is and disappear. Folio turns "what is this?" into "I'll remember this." Every encounter becomes a hand-painted watercolor portrait, archived in your folio with the date, the place, and the small story you choose to add. HOW IT WORKS Point your camera at a plant or animal. Folio identifies the species. A watercolor portrait — painted just for this encounter — appears moments later. The encounter is logged with an Encounter Index that marks how unusual the moment was: Common Find, Seasonal Find, Rare Find, or Fated Find. Add a Collector's Log if you want to remember more than the species name. Each entry settles into your folio. FIELD NOTES, QUIETLY TOLD Every species comes with a short, well-told Field Notes entry — the kind of thing a knowledgeable friend would tell you while standing next to you. No textbook prose. No taxonomy lectures. Just what's worth knowing. A COLLECTION THAT GROWS WITH YOUR WALKS Browse your folio as a grid of watercolor portraits, by date, or by rarity. Watch it fill in over weeks and seasons. The longer you carry it, the more it begins to feel like a record of where you've been and what you've stopped for. DESIGNED TO SHARE Each encounter generates a Field Journal card — composed like a specimen page, not a screenshot. Post it to Instagram, Xiaohongshu, or anywhere else you keep things. The encounter sentence shifts with the rarity tier — a Fated Find feels different from a Common one, and the card reflects that. FOR ANYONE WHO WALKS OUTSIDE You don't need to be a birder or a botanist. Folio is built for the city walker, the weekend hiker, the parent on a school run, the traveler with twenty minutes between meetings — anyone who has paused for something small and alive. Free to start. An optional subscription unlocks unlimited encounters and keeps every portrait in your folio for good. Step outside. Look up. The world has been waiting.

Screenshots

Arca.so4 screens
Folio Field Journal3 screens

Verdict

The call

The clearest difference is in-app purchases: Arca.so at none against Folio Field Journal's 2. Arca.so also leads on iOS requirement (15.1 vs 26.2). Folio Field Journal's advantage is update cadence (every 4 days vs every 10 days). 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. Folio Field Journal sells 2 in-app purchases, starting at $4.99 per month. Arca.so asks for nothing beyond the download.

UpkeepUpdate frequency

Arca.so ships an update every 10 days, Folio Field Journal every 4 days. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

Scorecard3 real differences · 7 level
Arca.so versus Folio Field Journal: the parameters behind the verdict, then further details
ParameterArca.soFolio Field Journal
PriceFreeFree
Rating4.0 (12 ratings) — better—
Positive reviews80.0% of reviews—
Number of ratings12 — better—
Update frequencyEvery 10 daysEvery 4 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPod — betteriPhone
Requires iOS15.1 — better26.2
Further details — not scored
Size64 MB195 MB
Age rating17+4+
Developersomefrogs OyKunlei He

In-app purchases

None

Arca.so

No in-app purchases

2 purchases

Folio Field Journal

Subscriptions2
  • folio unlimited monthly7 Days trial$4.991 Month
  • folio unlimited annual7 Days trial$34.991 Year

Questions

Is Arca.so free?
Arca.so is free to download, with no in-app purchases.
Is Folio Field Journal free?
Folio Field Journal is free to download, with in-app purchases available.
Do Arca.so or Folio Field Journal have ads?
Neither Arca.so nor Folio Field Journal shows ads.
Which is updated more often, Arca.so or Folio Field Journal?
Arca.so ships an update every 10 days, and Folio Field Journal every 4 days. Most recently, Arca.so was updated on October 30, 2026 and Folio Field Journal on October 31, 2026.

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