Comparison

Send to Kindle by KTool vs RSSum

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

Head to head
About

Send to Kindle by KTool

Easily send web articles, newsletters, and discussions to your Kindle device or app for offline reading. This tool cleans up content, preserves images, and offers features like creating custom magazines and managing subscriptions.

Highlights
  • Send articles via share sheet
  • Read Wikipedia and Hacker News on Kindle
  • Subscribe to newsletters directly to Kindle
  • Create custom daily/weekly magazines
  • Offline reading on Kindle devices and app
  • Guided Kindle setup
Features
Read full description

Send articles and newsletters to your Kindle, and read them away from the screens that tire your eyes. KTool turns what you want to read on the web into a clean Kindle read: long articles, X articles and the newsletters you subscribe to. It arrives on your Kindle e-reader or in the Kindle app, ready to read offline. ——— H O W I T W O R K S 1. Share an article to KTool from Safari, Chrome, X or another app, or paste a link on Home. 2. KTool cleans it up and keeps the images. 3. It lands on your Kindle shortly after. ——— F E A T U R E S — Send to Kindle from the share sheet — Send Wikipedia articles to Kindle — Send Hacker News discussions to Kindle — Read X articles on Kindle — Newsletters: get your own KTool address, subscribe with it, and every issue goes to your Kindle — Stop or unsubscribe from a newsletter in the app — Daily Magazine and Weekly Magazine: collect articles and receive them as one issue — Build your own magazines — Your delivery history on Home — Guided Kindle setup — Light and dark appearance — Sign in with Apple or Google KTool can send to: — Kindle e-readers sold by Amazon — The Kindle app on iPhone and iPad — The Kindle app on other platforms ——— K T O O L P R E M I U M KTool Premium is an auto-renewing subscription, billed weekly or yearly. Both options unlock the same features. Payment is charged to your Apple Account at confirmation of purchase. The subscription renews automatically unless it is cancelled at least 24 hours before the end of the current period. You can manage or cancel it in your App Store account settings. ——— C O N T A C T KTool: https://ktool.io Support: daniel (at) podzim.co ——— P R I V A C Y KTool only processes what you send to it. When you share or paste an article, the app sends the page and its URL to the KTool service, which packages it for reading and delivers it to your Kindle. Newsletters sent to your KTool address are processed the same way. More information: https://ktool.io/privacy T E R M S O F U S E Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

RSSum

A streamlined RSS reader designed for efficient content consumption. Stay updated with your favorite news sources and blogs in a clean, ad-free interface. Easily manage your subscriptions and discover new content.

Highlights
  • RSS feed aggregation
  • Ad-free reading experience
  • Subscription management
  • Content discovery
  • Clean user interface
Features
Read full description

Rss Reader

Screenshots

Send to Kindle by KTool4 screens
RSSum4 screens

Verdict

The call

The clearest difference is in-app purchases: RSSum at none against Send to Kindle by KTool's 8. RSSum also leads on update cadence (every 5 days vs monthly). Send to Kindle by KTool's advantage is review sentiment (25% vs 0%) and iOS requirement (16.4 vs 26.0). 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. Send to Kindle by KTool sells 8 in-app purchases, starting at $2.99 per month. RSSum asks for nothing beyond the download.

UpkeepUpdate frequency

Send to Kindle by KTool ships an update monthly, RSSum every 5 days. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

Scorecard5 real differences · 5 level
Send to Kindle by KTool versus RSSum: the parameters behind the verdict, then further details
ParameterSend to Kindle by KToolRSSum
PriceFreeFree
Rating—1.0 (1 ratings) — better
Positive reviews25.0% of reviews — better0.0% of reviews
Number of ratings—1 — better
Update frequencyMonthlyEvery 5 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemiumFree — better
DevicesiPhone, iPad, MaciPhone, iPad, Mac
Requires iOS16.4 — better26.0
Further details — not scored
Size47 MB47 MB
Age rating4+4+
DeveloperPodzim LLCJoao Valente

Customer experience

Send to Kindle by KTool

All ratings9 ratings
Positive44.4%
Neutral0.0%
Negative55.6%
Written reviews8 reviews
Positive25.0%
Neutral12.5%
Negative62.5%

RSSum

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

8 purchases

Send to Kindle by KTool

Subscriptions8
  • Unlimited Articles3 Days trial$2.991 Month
  • KTool Premium Weekly$4.997 Days
  • Unlimited Articles7 Days trial$5.991 Month
Show 5 more
  • Unlimited Access7 Days trial$9.991 Month
  • iOS Unlimited Articles3 Days trial$29.991 Year
  • KTool Premium Yearly$49.991 Year
  • Unlimited articles7 Days trial$59.991 Year
  • Unlimited Access7 Days trial$99.991 Year
None

RSSum

No in-app purchases

Questions

Is Send to Kindle by KTool free?
Send to Kindle by KTool is free to download, with in-app purchases available.
Is RSSum free?
RSSum is free to download, with no in-app purchases.
Do Send to Kindle by KTool or RSSum have ads?
Neither Send to Kindle by KTool nor RSSum shows ads.
Which is updated more often, Send to Kindle by KTool or RSSum?
Send to Kindle by KTool ships an update monthly, and RSSum every 5 days. Most recently, Send to Kindle by KTool was updated on November 3, 2026 and RSSum on October 30, 2026.

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