Comparison

PDFDarkMode vs Helper One

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

Head to head
About

PDFDarkMode

Easily convert PDFs to a comfortable dark mode with custom text and background colors. Reduce eye strain while reading or studying long documents. Save and revisit your personalized PDFs in a private library.

Highlights
  • Upload PDFs from device
  • Customize text and background colors
  • Preview dark mode changes
  • Download converted PDFs
  • Personal PDF library
  • Private by design
Features
Read full description

PDFDarkMode makes your PDFs easier on the eyes, day or night. Upload any PDF, choose your own text and background colors, preview your changes, and download your converted document directly within the app. Whether you’re studying, reading long-form writing, or reviewing technical documents, PDFDarkMode helps reduce eye strain and make your PDFs visually comfortable and fully personalized. Features • Upload any PDF from Files or your device • Customize text color and background color • Preview your converted PDF in full dark mode • Download it directly • Save and revisit all converted PDFs in your personal library • One-time in-app purchase to download a dark mode PDF for $2.99 • Upgrade to PDFDarkMode Pro for $9.99 to unlock unlimited dark mode PDF downloads Private by Design No logins. No analytics. No tracking. Your PDFs stay private.

About

Helper One

Read full description

Meet your personal AI assistant — one that actually looks at you and speaks to you. HelperOne gives you a real-time AI companion with a lifelike avatar. Ask questions, get help with tasks, or set up a specialised coach that calls your phone throughout the day to keep you on track. TALK, DON'T TYPE Speak naturally to your assistant. She listens, thinks, and responds with natural speech and facial expressions — not just text on a screen. CHOOSE YOUR ROLE Set up a Movement Coach who calls you for exercise breaks, a Nutrition Coach who tracks your meals from food photos, a Wellbeing Coach for daily check-ins, a Job Search Coach who finds listings every morning, or a General Assistant for anything else. SHE CALLS YOU Your assistant doesn't wait for you to open the app. She rings your phone at the times you agree on, with personalised reminders, check-ins, and encouragement. REAL-TIME VIDEO AVATAR Your assistant has realistic facial expressions, lip-sync, and natural body language — streamed live to your device. REMEMBERS EVERYTHING Your assistant writes her own memory after every conversation. She remembers your preferences, your schedule, your goals, and your progress — getting better the more you use her. SEARCHES THE WEB Need real-time information? Your assistant searches the web, analyses results, and gives you clear, concise answers with sources. YOUR KEYS, YOUR CHOICE Use the included AI model or bring your own API key from OpenAI, Anthropic, or OpenRouter. Full control over which model powers your assistant. Start with a free 3-day trial — no subscription required. — Subscriptions auto-renew unless cancelled at least 24 hours before the end of the current period. You can manage or cancel subscriptions anytime in your Apple ID settings. Privacy Policy: https://helperone.ai/privacy Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

PDFDarkMode4 screens
Helper One4 screens

Verdict

The call

The clearest difference is ads: PDFDarkMode at none against Helper One's shown. PDFDarkMode also leads on update cadence (every 4 days vs every 9 days) and iOS requirement (15.0 vs 17.0). On price, in-app purchases 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. PDFDarkMode sells 5 one-off in-app purchases and Helper One sells 4 in-app purchases, starting at $17.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

PDFDarkMode ships an update every 4 days, Helper One every 9 days. The most recent releases landed on September 10, 2026 and September 9, 2026 respectively.

Scorecard3 real differences · 7 level
PDFDarkMode versus Helper One: the parameters behind the verdict, then further details
ParameterPDFDarkModeHelper One
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 4 days — betterEvery 9 days
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPod — betteriPhone
Requires iOS15.0 — better17.0
Further details — not scored
Size4 MB91 MB
Age rating4+12+
DeveloperWildcatter LLCPeter Dove

In-app purchases

5 purchases

PDFDarkMode

One-time5
  • Download PDF (up to 100 pages)$0.99
  • Dark Mode PDF Download2 variants$2.99
  • Download PDF (up to 500 pages)$4.99
Show 2 more
  • PDFDarkMode Pro$9.99
  • Download PDF (500+ pages)$9.99
4 purchases

Helper One

Subscriptions4
  • Bring Your Own Key$17.991 Month
  • Pro$29.991 Month
  • Pro "Max 5x"$59.991 Month
Show 1 more
  • Pro "Max 20x"$124.991 Month

Questions

Is PDFDarkMode free?
PDFDarkMode is free to download, with in-app purchases available.
Is Helper One free?
Helper One is free to download, with in-app purchases available.
Do PDFDarkMode or Helper One have ads?
Helper One shows ads; PDFDarkMode does not.
Which is updated more often, PDFDarkMode or Helper One?
PDFDarkMode ships an update every 4 days, and Helper One every 9 days. Most recently, PDFDarkMode was updated on September 10, 2026 and Helper One on September 9, 2026.

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