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To use Seat Tracker, you must be a TripIt Pro member ($49 a year, though the Web site offers free 30-day trials).
And particularly if the publisher is a paying "pro" member.
In our case, we created a promotion, offering 6 months of Pro Member benefits for $10 per month (compared to $29.99/month).
If you are a SlideShare Pro member, which starts at $19/month, you can get password protected meetings, along with other bells and whistles.
The weeks prior to this promotion our Pro Member subscribtions were relatively flat; two week after running the promotion our subscriber base increased by 152%.
Now TripIt Pro will track any pro member's flight itinerary so they are notified of a price drop that could trigger a potential airline refund.
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The Flickr help guide for accounts also states that "eligible non-recurring Pro members can purchase a recurring Pro subscription," but that Flickr Pro gift accounts are no longer available to purchase.
Haot also notes that Livestream has over 1,000 paying Pro members, the premium service it launched last year.
Aviary Pro members can gain additional storage options like privacy and watermark control for $24.99 per year.
It allows Vimeo Plus or Pro members to add tip buttons to any video content, so that users can click and easily donate between $0.99 and $500.
The company first launched its On Demand program (which allows pro members to charge for access to their content) back in March 2013.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com