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aria2
aria2
C++2018–2026
aria2 / aria2

aria2

aria2 is a lightweight multi-protocol & multi-source, cross platform download utility operated in command-line. It supports HTTP/HTTPS, FTP, SFTP, BitTorrent and Metalink.

11Distinct people
12Mentions
0Explicit recommenders
43.5KGitHub stars
REPOSITORY AT A GLANCE

What to know before exploring

What it is

aria2 is a lightweight multi-protocol & multi-source, cross platform download utility operated in command-line. It supports HTTP/HTTPS, FTP, SFTP, BitTorrent and Metalink.

GitHub

Where it is used

No documented product use was verified in the last source check.

What people are saying

No recommendation phrase was found in the indexed comments.

No classified warning is attached to this page. Read the discussions before treating silence as approval.

Also in these discussions

No other repository is repeatedly linked in the same discussions.

This week on Hacker News

Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 3:03:16 PM UTC.

No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.

Mentions over time

HN mentions by year12 dated mentions

Observed mentions: 2018-11-19 15:22:21 UTC to 2026-10-13 10:11:50 UTC.

01232018-01-01 00:00:00 UTC to 2019-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments20182019-01-01 00:00:00 UTC to 2020-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2020-01-01 00:00:00 UTC to 2021-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2021-01-01 00:00:00 UTC to 2022-01-01 00:00:00 UTC (exclusive): 3 mentions; 1 submissions, 2 comments2022-01-01 00:00:00 UTC to 2023-01-01 00:00:00 UTC (exclusive): 2 mentions; 1 submissions, 1 comments20222023-01-01 00:00:00 UTC to 2024-01-01 00:00:00 UTC (exclusive): 3 mentions; 0 submissions, 3 comments2024-01-01 00:00:00 UTC to 2025-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2025-01-01 00:00:00 UTC to 2026-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2026-01-01 00:00:00 UTC to 2027-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments. Incomplete calendar period.2026*

* An incomplete calendar period is marked with an outlined bar. Its count is not directly comparable with a full period.

Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.

View mention counts and date ranges
UTC ranges include their start and exclude their end. Select a period to filter the source evidence.
PeriodStart (UTC)End (exclusive, UTC)MentionsSubmissionsComments
20182018-01-01 00:00:00 UTC2019-01-01 00:00:00 UTC101
20192019-01-01 00:00:00 UTC2020-01-01 00:00:00 UTC101
20202020-01-01 00:00:00 UTC2021-01-01 00:00:00 UTC000
20212021-01-01 00:00:00 UTC2022-01-01 00:00:00 UTC312
20222022-01-01 00:00:00 UTC2023-01-01 00:00:00 UTC211
20232023-01-01 00:00:00 UTC2024-01-01 00:00:00 UTC303
20242024-01-01 00:00:00 UTC2025-01-01 00:00:00 UTC101
20252025-01-01 00:00:00 UTC2026-01-01 00:00:00 UTC000
2026 (partial)2026-01-01 00:00:00 UTC2027-01-01 00:00:00 UTC101

What Hacker News says

12 sources
I use aria2 sometimes, but one thing that surprised me is that it doesn't fully support retries. As in, even if you pass something like "--always-resume=true --continue=true", if you try to use aria2c on a bad connection, you will sometimes get errors which make aria2c just exit. Thankfully it does have good resume support, so I was able to wrap aria2c in a bash script that calls it repeatedly until the download succeeds, but it's strange to me that this was necessary. Some relevant github issues: https://github.com/aria2/aria2/issues/1399 https://github.com/aria2/aria2/pull/2004
In Making big downloads resumable in Firefox
It is a client/server system, but pulling from $n hosts instead of just 1, spreading out the load and also downtime risk across all $n hosts. And the reason I mentioned the "ratio currency" is your use of the word "tolerated" here: BitTorrent isn't the mafia, it's just a protocol that offers the ability to share pieces back to the Internet. As another concrete example, aria2c (https://github.com/aria2/aria2#readme) behaves similarly: using BT to download, but then exiting without attempting to seed anything
In Building a BitTorrent client from the ground up in Go (2020)
Exceptions can be avoided with the use of `noexcept` whenever we can do avoid them, especially in sensitive areas that we cannot risk exception throws. > but I don't think GP deserved the downvotes for the speculation. That's why I asked @squid_demon for a real example that possibly got bitten by it; else, it's simply an emotional reaction for favoring one tool over another. If aria2 [1] that is implemented in C++ is extremely fast, then I can almost guarantee that transmission's refactoring in C++ will get there too, sooner or later. [1] https://github.com/aria2/aria2
In Transmission torrent client ported to C++

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